Universal line concentrator



July 30, 1963 R. G. FISHER UNIVERSAL LINE coNcENTRAToR 54 Sheets-Sheet l Filed May 24, 1960 /NVENTOR G. FISHER W.. C ,4l/MM ATTORNEY July 30, 1963 R. G. FISHER UNIVERSAL LINE CONCENTRATOR 34 Sheets-Sheet 2 Filed May V24, 1960 WON N @Tx /A/VENTOR G. F/SHE/P Uwe #www ATTORNEY 34 Sheets-Sheet 3 Filed May 24. 1960 /Nl/E/v Tof? R. G. FISHER lv/L. Q L6M/W m. GF.

A TTORNEV July 30, 1963 R. G. FISHER UNIVERSAL LINE CONCENTRATOR 34 Sheets-Sheet 4 Filed May 24, 1960 ATTORNEY July 30, 1963 R. G. FISHER UNIVERSAL LINE coNcENTRAToR 34 Sheets-Sheet 5 Filed May 24, 1960 MNM.

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ATTORNEY July 30, 1963, R. G. FISHER UNIVERSAL LINE CONCENTRATOR 34 Sheets-Sheet 6 Filed May 24, 1960 /A/l/E/vo@ R. G. FISHER July 30, 1963 R. G. FISHER 3,099,718

` UNIVERSAL LINE CONCENTRATOR A TTOR/VEV July 30, 1963 R. G. FISHER UNIVERSAL LINE c'oNcENTRAToR /NVE/vron R. G. FISHER 34 Sheets-Sheet B Filed May 24, 1960 onvl ATTORNEY July 30, 1963 R. G. FISHER 3,099,718

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ATTORNEY July 30, 1963 R. G. FISHER 3,099,718

UNIVERSAL LINE CONCENTRATOR Filed May 24, 1960 54 Sheets-Sheet 16 /N VEA/fop y R. G.F /SHE R A TTORNE V TO CENTRAL July 30, 1963 R. G. FISHER 3,099,718

UNIVERSAL LINE CONCENTRATOR Filed May 24, 1960 54 Sheets-Sheet 17 L//v/r /Go (I n.5.)

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UNIVERSAL LINE coNcENTRAToR 54 Sheets-Sheet 18 Filed May 24, 1960 TSMO TSM/ TSM? TSM@ TS M4 TSM? ATTORNEY July3o,1963 RGFISHER 3,999,719

UNIVERSAL LNE CONCENTRATOR Filed May 24, 1960 54 Sheets-Sheet 19 N o l@ s. Q Q 2 ES N o l l Q n V o Q u l Q Q Q N l aafa Y /A/VE/VTOR O: RG. FISHER BV gol @AIX/wal ATTORNEY July 30, 1963 R. G. FISHER UNIVERSAL LINE coNcENTRAToR 34 Sheets-Sheet 2O Filed May 24, 1960 Dn V. RE M OH R m F M NG. 

1. IN A TELEPHONE SWITCHING SYSTEM INCLUDING A CENTRAL OFFICE HAVING A PLURALITY OF SUBSCRIBER LINE CIRCUITS, THE COMBINATION COMPRISING A CENTRAL OFFICE CONCENTRATING UNIT; A REMOTE CONCENTRATING UNIT; FIRST AND SECOND PLURALITIES OF SUBSCRIBER STATIONS SERVED BY AND CONNECTED TO SAID REMOTE CONCENTRATING UNIT; A SOURCE OF SCANNING PULSES IN SAID CENTRAL OFFICE UNIT; FIRST, SECOND, AND THIRD PLURALITIES OF TRANSMISSION TRUNKS, TOGETHER FEWER IN NUMBER THAN BOTH OF SAID FIRST AND SECOND PLURALITIES OF SUBSCRIBER STATIONS INTERCONNECTING SAID CENTRAL OFFICE UNIT AND SAID REMOTE UNIT; SAID FIRST PLURALITY OF TRANSMISSION TRUNKS BEING CONNECTED THROUGH SAID REMOTE UNIT ONLY TO SAID FIRST PLURALITY OF SUBSCRIBER STATIONS, SAID SECOND PLURALITY OF TRANSMISSION TRUNKS BEING CONNECTED THROUGH SAID REMOTE UNIT ONLY TO SAID SECOND PLURALITY OF SUBSCRIBER STATIONS, SAID THIRD PLURALITY OF TRANSMISSION TRUNKS BEING CONNECTED THROUGH SAID REMOTE UNIT TO BOTH OF SAID FIRST AND SECOND PLURALITY OF SUBSCRIBER STATIONS; MEANS INTERCONNECTING SAID CENTRAL OFFICE UNIT AND CERTAIN OF SAID SUBSCRIBER LINE CIRCUITS, SCANNING MEANS RESPONSIVE TO SAID SCANNING PULSES FOR SIMULTANEOUSLY DETERMINING THE SUPERVISORY STATES OF SAID CERTAIN SUBSCRIBER LINE CIRCUITS AND FIRST, SECOND, AND THIRD PLURALITIES OF TRANSMISSION TRUNKS TO SAID REMOTE UNIT; AND MEANS INCLUDED IN SAID SCANNING MEANS FOR CYCLICALLY SCANNING SAID FIRST, SECOND, AND THIRD PLURALITIES OF TRANSMISSION TRUNKS A PLURALITY OF TIMES FOR EACH SCANNING CYCLE OF SAID CERTAIN SUBSCRIBER LINE CIRCUITS. 